Ice-machine compressor.



H. D. POWNALL. ICE MACHINE COMPRESSOR. Arrucmlou FILED 1m/21.1913.

1,249,822. I Patented Dee. A1u, 1917.

iii/mf @M N @w ceA ICEMACHINE COMPRESSOR.

inaliaeaa Specification of Letters Patent.

Patented Dec.. 11, 191'?.

rrpplcatoiiiiled May 21, 1913. Serial No. 769,0?3.

To all 'ui/wm it may concern."

lde it known that I, HENRY D. PowNALL, a citizen of the United States, residing at lGanton, in tliecounty of Stark and `State of liic, have invented certain new and use :tui improvements in lce-h/Iacliiue Coinpressors, oit which the to-llowing is a specil'icati on.

ldy invention relates to improvements in ice machine compressors. Une `of its objects is to provide an improved compressor in which the gas is admit-ted near the center' of the cylinder and between two fsingleacting plungei-s and expelled at opposite ends or the cylinder through downwardly directed exit ports arranged'to take care oi any liquid as well as gas which may enter the cylinder and to permit the gas andliquid to both be completely expelled therefrom. linotlier object is to provide improved means to prevent heat or ei'liciency losses and to provide an improved cooling or jacket system. Another object is to provide an improved arrangement whereby the cylinder heads may be conveniently detached and the cylinder and parts therein contained made readily accessible. My invention also comprises certain details of liorm, combination and arrangement, all of which will be fully set orth in the description of the acv coinpanying drawings, in which- Figure l is a central vertical longitudinal section through my improved compresser.

llig. 2 is a central vertical section on line n fv of Fig. l.

llig. 3 is a top plan detail of one of the exit ports from the interior oit the cylinder.

Fig. el. is a sectional detail through the cross-head guide on line e e of liig. l.

The accompanying drawings c illustrate the preferred embodiment of my invention in which ik represents the cylinder supported upon a base 2. Biepresents a base or iframe in which the driving or crank shaft 3 is journaled, and which also carries the cross head guides Ll and is bolted to the torward end oi the cylinder outside of the cylinder head. C represents the plunger rod land D D represent the plungers rigidly mounted upon said rod. The ends of the cylinder are closed by heads E E. F represents the gas intake pipe which taps au annular gas intake chamber b preferably ltorined integral with the cylinder', and troni the valve in position," aiid to guide and liinit its movement. The ring Q'is provided with metal packing rings 15` to `torni a tight joint between the plunger and cylinderwall.` The `cylinder heads are cuppedoii their inner laces with beveled edges 16, andthe plunger valves `and their keepers "are" correspondingly beveled so that at the end oi `the plunger stroke there is practically no space or clearance between `the cylinder heads and plungers."Utl'sets are provided between the meeting 'faces of the heads and cylinder to receive narrow packing rings 17, which. are confined upon all sides so that they cannot flatten out or escape, and

light strains on the bolts which lock the heads in place. The gas exit ports `1 9 are located atthe extreme end of the plunger to said ports which insi'lres an exit 'for the last poiftn'in of either gas or liquid as the plungers `complete their stroke and come the cylinder heads. `llhe enit valve `chainbei's are preferably formed integralcwith the cylinder and provided `at `their lewe ends with caps 9.0 through which `the exit valves and their cages and seats may be removed whenreqiiired. Oiiitake pipes 21 `are tapped into the `sides oit said chambers-` lExit 1valves 22 close the exit ports 19` as 'close to the inner cylinder-wall as practicable.

At tliefiorwai'd endol the cylinder `the Il ange Zei to which the cylinder head is bolt ed is extended outwardly from the peripheryot the cylinder head to aiifoid an eiigaging 'face for the end ot traine"Band` to which it is firmly secnredby bolts 5. This arrangement ot parts enables the` forward cylinder head to bedisconnectedand partly oi' wholly removed through the channel of the cross head guides thus giving access to `en hence enable tight joints to be secured withn `90 practically into contact with the faces ot the forward end of the cylinder without discoimecting the cylinder from the frame B.

lVhere the cool gas enters the intake chamber 6 and the central portion of the cylinder between the plungers there is a retrigerating effect o-r a tendency for the cool gas to take up heat and thus reduce the eliiciency of the compressor, Which tendency is reduced to a minimum by providing outwardly projecting annular flanges 25 at the limits of this section of the cylinder and inclosing the cylinder within these llanges with a belt or insulating material 26 such as cork for instance. This belt may if desired be extended entirely around the cylinder but ordinarily as the space Within the base 2 of the cylinder is a closed air space or pocket, and therefore a good insulating material, no insulating material other than said air space is employed Within the base 2.

From the flanges 25 to the respective ends of the cylinder the tendency is for the cylinder Walls to become heated to temperatures above the normal atmospheric temperature, which increase progressively toward the ends of the cylinders, While the cylinder heads tend tor become still more highly heated. The tendency or' this high temperature in the ends ot the cylind r is to heat the cool gas as it enters the ends of the cylinder and thus reduce the eiiciency of the compressor. This tendency to heat is counteracted as `liar as possible by providing annular water jackets 27 and 28 surrounding the ends of the cylinder and independent water jackets 29 and 30 in the respective cylinder heads.

Separate water supply pipes 3l and 32 controlled by valves 3 8 and 3l supply Water respectively to the loiver portions of jackets 27 and 2S to cool the ends of the cylinders, and separate water supply pipes 35 and 36 controlled by valves 37 and 3S snpplyivater respectively to the lower portions of the jackets 29 and 30 to cool the cylinder heads. rlhe Water in the respective jackets as it becomes heated rises to the upper portions of said jackets Where it escapes through branch exit pipes 39 and l0 at each end Which for convenience unite into one com- `mon exit pipe 41 at each end of the cylinder. This arrangement enables the amount of cooling Water supplied tothe respective jackets to be varied, depending upon the temperature of the cooling Water, the external temperature, and the work being done by the compressor, and also enables relatively different amounts oiE cooling water to he supplied to the several ackets according to their requirements, thus securing an increased compressor eiliciency.

The mechanism herein illustrated and described is capable of considerable modilication without departing from the principle of my invention.

Having described my iinyenlion, what .l claim is:

l. An ice machine compressor comprising a cylinder having a centrally located gas intake port and gas exit ports leading lroni opposite ends thereof, plungers reciprocating in said cylinder on opposite sides olI said gas intake port to compress and discharge. gas at opposite ends oit said cylinder, a belt of insulating material protecting the central portion of said cylinder exleriorly, and scparate annular water jackets cn '^ircling oppo site ends oli said cylinder. separaic wacr jackets located in the respective, cylinder heads, said respective cylinder and head jackets being each provided ith an independent valve controlled water supply conduit to provide ior an independently ad justable Water supply.

2. An ice machine compressor comprising a cylinder having a centrally located gas intake port and cylinder heads and gas exit ports at opposite ends, separate plnngcrs in said cylinder on opposite sides ol said intake port reciprocating toward and [from said intake port, separate walcr jackets in the cylinder walls at opposite cads ol said cylinder, and separate water jackets in the respective cylinder heads, .said rcspeoliivc cylinder and head jackets being cach provided with an independent valve conlrolkal water supply conduit.

3. An ice machine compressor comprising a cylinder having a centrally located gas intake port and cylinder heads and gas exit ports at opposite ends thereof, separate plungers reciprocating in oppositey ends oif said cylinder toward and liroin said gas intake port to compress and discharge gas al opposite ends ol .said cylinder. a belt ol insnlating material to protect (he central por tion of the cylinder 'l'rom acquiring hcar externally, independent water jackets encircling opposite ends ot said cylinder to remove heat rom the cylinder ends and independent water jackets located in the cylinder heads to remove heat therefrom, said Water jackets being cach prorided with an indepeinlcnt valve controlled walcr supply conduit to provide for a variable walcr lsnpply to the several jackets.

ln testimony whereof l have allixed my signature in presence of two witnesses.

HENRY D. POlVNriliL Witnesses DAvrD B. DAY, JAMES K. LYNCH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner o Patents. Washington, D. C. 

